The Navy had a problem. Even sturdy oak warships suffered from wood boring insects when deployed to warm climates. In 1750-something they put a copper sheath on the bottom of an oak ship, a frigate I think. It worked and soon most of our navy (ships, not sailors) had their bottoms clad in copper.
If you visit Appledore in Devon and walk along an unpromising path just beyond the lifeboat station you pass a small area of sand/mud exposed at low tide. The rocks are blackened from fire. Someone told me that In days of wood any small vessels that were no longer useful were burnt here and the copper rivets recovered. It supplemented the income of families.
So, if copper was good enough for the navy ships of the line and good enough to fix smaller boats together, probably OK on cabinet doors.